CN103727960B - A kind of radio altimeter interference signal production method based on DRFM - Google Patents
A kind of radio altimeter interference signal production method based on DRFM Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/882—Radar or analogous systems specially adapted for specific applications for altimeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/4056—Means for monitoring or calibrating by simulation of echoes specially adapted to FMCW
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
- G01S7/4065—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder involving a delay line
Abstract
The invention discloses a kind of radio altimeter interference signal production method based on DRFM technologies, this method produces the distance deception jamming signal to altimeter using the datacycle storage based on DRFM and read-write delay precision Control Technology；Using the digital noise modulation technique based on DRFM, the RF noise jamming signal to altimeter is produced；Using the datacycle storage based on DRFM and digital convolution filter technology, the generation to altimeter false target jamming profile signal is realized；Using the shift-frequency jamming technology based on DRFM, the generation apart from speed sync interference signal to altimeter is realized.The comprehensive altimeter interference signal produced using the above method, meets the demand of anti-warship guided missle radio altimeter interference free performance test.The technology has been applied to the wireless universal electrical height analogue means that naval aviation engineering college develops, and completes the test to amphitypy radio altimeter, demonstrates the correctness of this method.The radio altimeter interference signal that the present invention is produced, is applicable not only to missile-borne radio altimeter, can also be applied to airborne radio altimeter.
Description
Technical field
The present invention relates to a kind of radio altimeter interference signal production method based on DRFM, category equipment Test technology neck
Domain.Mainly for generation of the interference signal to a variety of system radio altimeters, the interference free performance for measuring altimeter.
Background technology
Research of the China to radio altimeter Anti-Jamming Technique and interference signal generation technology is started late.Domestic missile-borne
The height signal simulator that altimeter performance test is used, successively employs equivalent cable box scheme, SAW delay line side
Case or fibre delay line scheme, these can not all be superimposed interference information in altitude signal, also can not just measure the anti-of altimeter
Jamming performance.Therefore, the simulation of altimeter Research on anti-interference technique altimeter interference signal in the urgent need to address produces problem.
The content of the invention
The present invention relates to a kind of missile-borne radio altimeter interference signal production method based on DRFM technologies.This method
General principle is that on the basis of analyzing radio altimeter signal characteristic, DRFM technologies are disturbed applied to altimeter
Signal imitation, using DRFM technical characterstic, is produced to a variety of dry of the different system radio altimeters such as pulse and continuous wave
Disturb pattern.1. using the circulation storage based on DRFM and read-write data delay precision Control Technology, by continuously changing output letter
The time delay of number relative input signal, produce the distance deception jamming signal to altimeter；2. the numeral based on DRFM is used
Noise modulated technology, using DRFM Signal fine-feature copy function, modulates on the decoding output signal of DRFM circuits and makes an uproar
Tone width or the phase modulation factor, produce the radio noise modulated interferer signal to altimeter；3. using datacycle memory technology and
Digital convolution wave filter technology, recovers advance line number word filtering process in decoding by DRFM data storage, produces to altimeter
Multi-false-target jamming signal；4. the shift-frequency jamming technology based on DRFM is used, height is believed using digital quadrature mixing mode
Number frequency shift modulation is carried out, produced to distance-speed sync interference signal of altimeter.Comprehensive technical measures every more than,
A variety of jamming signal types to radio altimeter are produced, meets and interference free performance experiment is carried out to different system radio altimeters
Demand.
Brief description of the drawings
Fig. 1 LFMCW time domain plethysmographic signals and spectrogram
Fig. 2 LFMICW signal time-frequency figures
Fig. 3 LFMICW time domain plethysmographic signals and spectrogram
Altimeter interference signals of the Fig. 4 based on DRFM produces block diagram
Cheating interferences of the Fig. 5 to linear frequency modulation continuous wave
Fig. 6 FIR filter structures
False target jamming profiles of the Fig. 7 to linear frequency modulation continuous wave
Digital noise modulations achievements of the Fig. 8 based on DRFM
RF noise jammings of the Fig. 9 to linear frequency modulation continuous wave altimeter
Figure 10 is disturbed the noise phase modulation of linear frequency modulation continuous wave altimeter
Frequency shift modulation implementation methods of the Figure 11 based on DRFM
Shift-frequency jammings of the Figure 12 to linear frequency modulation continuous wave altimeter
Embodiment
The present invention is on the basis of analyzing radio altimeter signal characteristic, data of the integrated use based on DRFM
Circulation storage and read-write delay precision Control Technology, digital noise modulation technique, digital convolution wave filter technology and based on numeral
The frequency shift modulation technology of orthogonal mixing, realizes the radio noise to radio altimeter, noise phase modulation, range gate deception and false mesh
The simulation of the interference signals such as mark, the need for meeting different system radio altimeter interference free performance tests.
The present invention particular content be：
1st, missile-borne radio altimeter signature analysis
Different according to transmission signal feature, radio altimeter is divided into two kinds of systems of pulse and continuous wave.
(1) the pulse signal feature of altimeter
Radio altimeter transmitting wireless pulse signal irradiation ground (sea) face of pulse regime, by detecting echo impulse
The time delay of forward position relative transmission pulse front edge determines the flying height of guided missile, including monopulse systems, linear frequency modulation arteries and veins
Punching press contracting system, pseudo-random phase coding system etc., its transmission signal feature and operation principle are identical with pulse radar.
The most frequently used pseudo-random phase encoded signal is pseudorandom Coded Signals, is modulated using { 0, π } biphase coding,
The plural form of signal is：
The envelope function of signal is：
For biphase codingThen the complex envelope of pseudorandom Coded Signals is：
In formula,For the complex envelope of pseudorandom Coded Signals subpulse function；τ1For signal subspace pulse width；N
For signal subspace pulse number；τ=N τ1For signal time width.
(2) the CW with frequency modulation signal characteristic of altimeter
The radio altimeter emission signal frequency of continuous wave system is changed over time, typically using linear frequency modulation continuous wave
(LFMCW), signal frequency presses triangular wave or sawtooth waveforms rule linear change.Using swept-frequency signal on symmetrical triangle linear frequency modulation as
, the complex expression of signal is：
In formula, A0For signal amplitude；f0For signal carrier frequency；For signal initial phase；K=B/T is chirp rate, and B is tune
Bandwidth, T is the effective time width of frequency sweep section.The instantaneous frequency of signal is f=f0+Kt；The complex envelope of signal is：
A (t) is through Fourier transform, and obtaining its frequency spectrum is：
A (f)=U0e-jπf(f/K-T){[c(v1)+c(v2)]+j[s(v1)+s(v2)]} (6)
In formula, c (v), s (v) are Fresnel integral,
(7)
(8)
The time domain waveform and frequency spectrum of linear frequency modulation altimeter signal are as shown in Figure 1.
(3) the frequency modulation quasi c. w. signal characteristic of altimeter
To make altimeter have continuous wave system and the advantage of pulse regime concurrently, linear frequency modulation quasi c. w. can be used
(LFMICW) ripple gate control pulse is added on the basis of signal, Linear Frequency Modulation continuous wave, with rectangular pulse string PT(t) transversal is removed
Property CW with frequency modulation signal S (t), LFMICW signals are expressed as：
ST(t)=PT(t)·S(t) (9)
Wherein, PT(t) it is rectangular pulse functions,
In formula, TPFor the pulse repetition period；TfFor pulse width；Dutycycle η=Tf/TP.The time-frequency figure of LFMICW signals is such as
Shown in Fig. 2, time domain plethysmographic signal and frequency spectrum are as shown in Figure 3.
2nd, the height cheating interference signal based on DRFM is produced
Distance deception jamming to radar is similar to the height cheating interference of altimeter.To the height of linear frequency modulation system
Table, by transmission signal and receives the difference on the frequency between signal and detects elevation information, and frequency deviation is superimposed in altitude signal can be with
The height cheating interference to altimeter is realized, height cheating interference can also be realized by entering line delay to altitude signal.It is right
In the altimeter of pulse regime, height cheating interference can only be produced by the latter.To take into account the altimeter of different systems, the present invention
Height cheating interference signal is produced using the method that delays time to control is carried out to altitude signal.
Altimeter interference signal based on DRFM produces theory diagram as shown in figure 4, its core is DRFM circuits.
The operation principle of DRFM circuits is：Altimeter transmission signal is down-converted to baseband signal, then it entered by A/D converter
Row sampling and quantization, and sampled data is stored in data storage.Under the control of delay control circuit, when postponing by one section
Between after, by the data read-out in data storage, revert to baseband signal by decoding restoring circuit, then change through upconverter
Exported for radiofrequency signal.If signal sample circuit and decoding restoring circuit use identical clock signal, and clock frequency is not low
In twice of base-band signal frequency, according to nyquist sampling theorem, entrained by the signal and input signal after recovering through decoding
Information it is identical, simply have a delay, the size of the numerical value representative simulation height of the time delay in time.If control letter
Number time delay change, it is possible to the change of simulated altitude, reaches the effect that height deception is carried out to altimeter.To linear frequency modulation
The interference effect of the height cheating interference signal of continuous wave system altimeter is as shown in Figure 5.
3rd, the decoy signal based on DRFM is produced
One decoy can be regarded to the height cheating interference signal of altimeter as, to produce to the multiple of altimeter
False target jamming profile signal, can be realized by the digital filtering technique based on DRFM.
Input signal is converted to by data signal by DRFM circuits, using the filter function of Digital Signal Processing, passed through
Digital convolution wave filter produces multiple false target jamming profiles to altimeter.N number of decoy is produced according to FIR filter, then：
N=0,1 ... ... (11)
Wherein, N is decoy quantity；M is the time difference between adjacent decoy；For between each decoy
Amplitude Ratio, if it is desired to each decoy amplitude is identical, then β (i) ≡ 1；The structure of FIR filter is as shown in Figure 6.
The multiple decoys realized by convolution filter method can keep the correlation with altimeter transmission signal, many
After individual false target jamming profile signal is by the matched filtering of radio altitude sheet receiver, correlative accumulation processing, it can show not
The peak value echo of different amplitudes is produced in same height, the effect to altimeter multi-false-target jamming is reached.Linear frequency modulation is connected
The false target jamming profile effect of continuous ripple system radio altimeter is as shown in Figure 7.
4th, the radio noise signal based on DRFM is produced
Radio noise is that white noise is filtered with wave filter, and the noise of amplified obtained finite bandwidth, and its is general
Rate is distributed Normal Distribution：
Wherein, phaseIt is uniformly distributed in (- π, π), and and An(t) it is separate；ωjFor carrier frequency, numerical value is much larger than
SJ(t) spectrum width；Envelope function An(t) Rayleigh distributed, i.e.,：
The characteristics of can retaining radiofrequency signal fine feature using DRFM, produce the noise interferences to altimeter.Will
After altimeter transmission signal is by down coversion and analog-to-digital conversion, is converted to digital information and accurately stores.During output from
Data storage reads the data of storage, using digital noise modulation technique, by the two-way quadrature information S of DRFM circuit outputsI
(n), SQ(n) as carrier signal, a digital noise signal is modulated over the carrier signal, i.e.,：
In formula,For the equally distributed phase sequence in (- π, π)；A (n) is the envelope sequence of Rayleigh distributed
Row.Digital noise modulation principle block diagram based on DRFM is as shown in Figure 8.
The two paths of signals S ' modulated through digital noiseI(n), S 'Q(n) by orthogonal modulation, decoding recover, up-conversion and
After power combing, the radio noise signal output to altimeter is used as.Interfering signal power spectrum after modulation is altitude signal work(
Rate composes the convolution with zoop power spectrum.Radio noise signal to linear frequency modulation continuous wave system altimeter as shown in figure 9,
Wherein the jamming-to-signal ratio JSR=0dB of (a) figure, the jamming-to-signal ratio JSR=10dB of (b) figure.
5th, the noise phase modulation interference signal based on DRFM is produced
Noise phase modulation interference signal be the phase of signal by noise modulated, its complex expression is：
Wherein, AJFor interference signal amplitude；ωjFor carrier frequency；βpmFor coefficient of phase modulation；The noise that u (t) modulates for needs
Signal, is the generalized stationary random process that average is 0；To be uniformly distributed in [0,2 π], and with separate random of u (t)
Variable.
If it is σ that u (t), which is variance,nGaussian noise, define effective phase shift D=βpmσn, then the power spectrum of noise phase modulation signal
For：
The general power of noise phase modulation signal is：
Using DRFM coherent copy function, noise phase modulation modulation is carried out in altitude signal, i.e., is stored in DRFM circuits
The noise phase modulation factor is multiplied by data, i.e.,：
Wherein,U (n) is noise signal.The implementation method of noise phase modulation interference signal is with making an uproar
Tone width interference signal is similar, and difference, will simply using A (n) therein as constantIt is used as modulation letter
Number altitude signal is modulated.The phase modulation of linear frequency modulation continuous wave altimeter is done when Figure 10 show effective phase shift D=10
Disturb, the jamming-to-signal ratio JSR=0dB of (a) figure, the jamming-to-signal ratio JSR=10dB of (b) figure.
6th, the shift-frequency jamming signal based on DRFM is produced
Shift-frequency jamming to altimeter is that the carrier frequency of altitude signal is changed into a frequency displacement f up or downd, i.e., former high
A phase shift factor is multiplied by the basis of degree signal S (t)：
For the altimeter of linear frequency modulation continuous wave system, height can be played to the shift-frequency jamming of altitude signal and is taken advantage of
The effect of interference is deceived, the altimeter for having speed measuring function concurrently can also play the effect of velocity gate deception interference.
The implementation method of shift-frequency jamming based on DRFM is to utilize digital quadrature mixing technology, realizes the shifting to altitude signal
Frequently.If the altitude signal after DRFM samplings is：
Carrying out the in-phase component after orthogonal transformation is：
Quadrature component after conversion is：
By in-phase component SI(n) with quadrature component SQ(n) cos (2 π f are multiplied by respectivelydN) with sin (2 π fdN), then by two
Road signal subtraction can be obtained：
From formula 23, after digital quadrature mixing, output signal SJ(n) than former altitude signal S (n) frequency more
Move component fd, that is, the shift-frequency jamming to altitude signal is realized, implementation method is as shown in figure 11.To linear frequency modulation continuous wave height
The shift-frequency jamming effect of table is as shown in figure 12.
The present invention has been applied to the radio altimeter global altitude analogue means that naval aviation engineering college develops, and
Naval warehouse is delivered with the motor-driven Support Equipment of naval and guided missile repair track universal test system and ordnance repair shop uses, and is completed
Test to amphitypy guided missile radio altimeter, obtains the favorable comment using unit.Think using unit：Naval aviation engineering college
The altimeter interference signal production method based on DRFM of design, meets missile-borne radio altimeter service behaviour and anti-interference
Energy testing requirement, may be directly applied to the experiment of radio altimeter interference free performance and tests.
The radio altimeter interference signal that the present invention is produced, is applicable not only to missile-borne radio altimeter, can also push away
Airborne radio altimeter is extensively applied to, popularizing application prospect is wide.
Claims (1)
1. a kind of radio altimeter interference signal production method based on DRFM technologies, it is characterised in that high to radio
On the basis of degree table signal characteristic is analyzed, DRFM technologies are simulated applied to altimeter interference signal, DRFM skill is utilized
Art feature, produces a variety of jamming signal types to different system radio altimeters；To make altimeter have continuous wave system and arteries and veins concurrently
The advantage of system is rushed, using linear frequency modulation quasi c. w. signal, adds ripple gate control pulse on the basis of Linear Frequency Modulation continuous wave,
With the disconnected linear frequency modulation continuous wave signal of rectangular pulse truncation；1. it is accurate using datacycle storage and read-write delay based on DRFM
Control technology, by changing data read-out and the signal recovery time of memory, changes output interference signal relative input signal
Time delay, produce to the distance deception jamming signal of altimeter；2. the digital noise modulation technique based on DRFM, profit are used
With DRFM Signal fine-feature copy function, the sample signal after DRFM is recovered is modulated one as carrier wave, thereon and made an uproar
Tone width or the phase modulation factor, realize the radio noise modulated interferer to altimeter；3. using sampled data circulation memory technology and
Digital convolution wave filter technology, the data signal that DRFM is stored is handled before decoding recovers by digital filtering, is produced to height
Spend multiple false target jamming profile signals of table；4. the shift-frequency jamming technology based on DRFM is used, is entered using digital quadrature mixing mode
Row frequency shift modulation, realizes that distance-speed sync to altimeter is disturbed；Comprehensive technical measures every more than, are produced to height
The interference signal of a variety of patterns of table is spent, the demand tested different system radio altimeter interference free performances is met.
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| CN105607092B (en) * | 2016-01-27 | 2017-10-31 | 中国人民解放军国防科学技术大学 | GNSS cheating interference localization methods based on TDOA and power measurement values |
| CN106533456B (en) * | 2016-11-21 | 2018-09-21 | 北京振兴计量测试研究所 | A kind of two waveband height equivlent simulator |
| CN108627808B (en) * | 2017-03-15 | 2022-01-18 | 武汉玉航科技有限公司 | Method for processing ultra-wideband digital signal of radar jammer |
| CN110954873B (en) * | 2019-12-20 | 2022-01-25 | 北京航天微电科技有限公司 | Multi-band radar interference system and method |
| CN112290941B (en) * | 2020-10-11 | 2021-06-08 | 山西天枢空管科技有限公司 | Modulation signal generation method, generator and transmitter for civil aviation navigation equipment |
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